The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 04, 1979
Filed:
Jul. 25, 1977
Kenneth W Scott, Coronado, CA (US);
Other;
Abstract
A water heater control system is provided to lower the temperature to which hot water is heated during periods of low use, and raise the temperature back up during periods of peak demand. The unit described herein is adapted for use on a recirculating hot water system used in apartment buildings and includes a first thermoswitch disposed on the outflow pipe from the hot water tank which feeds this recirculating system. This pipe is hotter during periods of low use because the heater is adequate to provide continuous supply of very hot water which has not been drained by tenant use. Thus this thermoswitch is directly wired to a thermostat control to reduce the heater temperature when the thermoswitch is hot. A second switch is mounted on the cold water inflow supply pipe into the water heater, this thermoswitch being wired in series with the first thermoswitch, this switch being closed only when it is cooled, similar to the first thermoswitch, so that when the inflow supply pipe is cool due to high usage and thus continuous input of cold water, the second thermoswitch closes, which permits the first thermoswitch to control the system. During quiescent periods of low use, the inflow warms due to conduction from the hot water tank, thus opening the second thermoswitch and making the first switch ineffective.